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Investments - Components of assets and liabilities (Parentheticals) (Details 3) - USD ($)	Jul. 31, 2015	Apr. 30, 2015
EAM Trust
Schedule Of Equity Method Investments [Line Items]
Payable to VLI for its accrued non-voting revenues and non-voting profits interests	$ 2,037,000	$ 1,951,000

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Sum of the carrying values as of the balance sheet date of accrued payable non-voting revenues and non-voting profits interests.

+ References

No definition available.

+ Details

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- Details

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